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RISS 인기검색어
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- 저자 : 김동한(D. H. Kim) (검색결과 58 건)
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김동한(D. H. Kim),장경영(K. Y. Jhang),장석원(S. W. Chang) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
Backside defect of plate structure may grow due to fatigue or overload to cause critical failure during operation, so it is important to detect this kind of defect in line. For this purpose, nondestructive, non-contact and highly sensitive method is required, and ESPI and Shearography are considered as useful methods to satisfy these requirements. In this paper, the possibility of application of ESPI and Shearography to detect the backside defect of steel plate and to quantify the defect size was tested. For the experiment, some steel plates with a circular defect on the backside were prepared. Experimental results for these plates showed that location and size of defect could be detected correctly by both of ESPI and Shearography.
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탄성 영상법 개발을 위한 유연성 높은 초음파 시스템의 구현
김동인,이수열,조민형,Kim, D.I.,Lee, S.Y.,Cho, M.H. 대한의용생체공학회 2012 의공학회지 Vol.33 No.1
Recently, several ultrasound imaging techniques for tissue characterization have been developed. Among them, ultrasound elastography is regarded as the most promising modality and has been rapidly developed. One of ultrasound elastography techniques is shear modulus imaging. Normal and cancerous tissues show big difference of shear moduli and they have good image contrast. However shear wave elastography requires more complicated hardware and more computations for image reconstruction algorithm. Therefore new efficient techniques are being developed. In this paper, we have developed a very flexible ultrasound system for elastography experiments. The developed system has capabilities to acquire ultrasound RF data of all channels and generate arbitrary ultrasound pulse sequences. It has a huge amount of memories for RF data acquisition and a simple and flexible pulse generator. We have verified the performance of the system showing conventional B-mode images and preliminary results of elastography. The developed system will be used to verify our own reconstruction algorithm and to develop more efficient elastography techniques.
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가스분말사출성형에서 공정조건 변화가 중공부 형성에 미치는 영향
김동한(D.H. Kim),박형필(H.P. Park),이계환(K.H. Lee),차백순(B.S. Cha),최재혁(J.H. Choi),이병옥(B.O. Rhee),Jorge A. Tovar 한국소성가공학회 2011 금형가공 심포지엄 Vol.2011 No.9
Gas-assisted injection molding (GAIM) produces parts with hollow internal sections and it provides benefits to powder injection molding (PIM) due to the less material usage and reduced time required for de-binding processes. In this study, the effects of processing parameters on gas penetration length of gas-assisted powder injection molding (GAPIM) were investigated for 316 stainless steel (SUS316L) powder feedstock based on the Taguchi method. The processing variables were melt temperature, shot size, gas pressure, and gas delay time. The most significant parameters affecting gas penetration length were gas delay time and shot size, while the significance of melt temperature and gas pressure was low relatively.
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